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Goodman GMEC96 Series Service And Troubleshooting

Two stage furnace with multi-speed ecm motor
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Service and Troubleshooting
Goodman
®
Two Stage Furnace with multi-speed ECM Motor
Pride and workmanship go into every product to provide
our customers with quality products. It is possible, however,
that during its lifetime a product may require service.
Products should be serviced only by a qualified service
technician who is familiar with the safety procedures
required in the repair and who is equipped with the proper
tools, parts, testing instruments and the appropriate service
manual. REVIEW ALL SERVICE INFORMATION IN THE
APPROPRIATE SERVICE MANUAL BEFORE
BEGINNING REPAIRS.
Only personnel that have been trained to install, adjust,
service or repair(hereinafter, "service") the equipment
specified in this manual should service the equipment. The
manufacturer will not be responsible for any injury or
property damage arising from improper service or service
procedures. If you service this unit, you assume responsi-
bility for any injury or property damage which may re-
sult. In addition, in jurisdictions that require one or more
licenses to service the equipment specified in this manual,
only licensed personnel should servise the equipment.
Improper installation, adjustment, servicing or repair of
the equipment specified in this manual, or attempting to
install, adjust, service or repair the equipment specified in
this manual without proper training may result in product
damage, property damage, personal injury or death.
PROP 65 WARNING
FOR CALIFORNIA CONSUMERS
Cancer and Reproductive Harm -
www.P65Warnings.ca.gov
Brand GMEC96/GCEC96 & Amana
WARNING
WARNING
Copyright ©
2014-2020 Goodman Manufacturing Company, L.P.
is a registered trademark of Maytag Corporation or its related companies and is used under license.
®
Important Information ............................................ 2
Product Identification ........................................... 4
System Operation ...................................................... 7
Scheduled Maintenance ....................................... 42
Servicing ..................................................................... 46
Checking Voltage .............................................. 47
CHECKING WIRING .................................................. 47
CHECKNG THERMOSTAT, WIRING ........................ 47
Heating Anticipator ........................................... 47
CHECKING TRANSFORMER AND CONTROL
CIRCUIT ...................................................................... 47
Checking Duct Static ........................................ 48
Checking Temperature Rise .......................... 49
Checking Primary Limit Control ................. 49
Induced Draft Blower Motor ...................... 52
Cecking Gas Valve (Redundant) ................... 52
Checking Main Burners ................................... 52
Checking Orifices .............................................. 52
Checking Gas Pressure .................................. 53
Checking Hot Surface Ignitor ..................... 55
Checking For Flashback ................................. 55
Checking Pressure Switch............................ 55
HIGH ALTITUDE APPLICATION ............................... 56
Checking For Delayed Ignition .................... 56
CHECKING INTERGRATED IGNITION CONTROL
BOARDS ..................................................................... 56
Checking Flame Sensor ................................... 57
Troubleshooting Chart ....................................... 58
Wiring Diagrams ....................................................... 61
0140M00517-A
All rights reserved.
Brand AMEC96/ACEC96
®

TABLE OF CONTENTS

RS6612013r10
June 2020

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Summary of Contents for Goodman GMEC96 Series

  • Page 1 TROUBLESHOOTING CHART ........58 www.P65Warnings.ca.gov WIRING DIAGRAMS ............61 0140M00517-A RS6612013r10 June 2020 Copyright © 2014-2020 Goodman Manufacturing Company, L.P. is a registered trademark of Maytag Corporation or its related companies and is used under license. ® All rights reserved.
  • Page 2 IMPORTANT INFORMATION IMPORTANT NOTICES FOR CONSUMERS AND SERVICERS RECOGNIZE SAFETY SYMBOLS, WORDS AND LABELS Pride and workmanship go into every product to provide our customers with quality products. It is possible, however, that during its lifetime a product may require service. Products should be serviced only by a qualified service technician who is familiar with the safety procedures required in the repair and who is equipped with the proper tools, parts, testing in-...
  • Page 3 IMPORTANT INFORMATION CO can cause serious illness including permanent brain damage or death. B10259-216 Advertencia especial para la instalación de calentadores ó manejadoras de aire en áreas cerradas como estacionamientos ó cuartos de servicio. Las emisiones de monóxido de carbono pueden circular a través del aparato cuando se opera en cualquier modo.
  • Page 4 7,8,9 Brand Minor Revision ® A - Amana Brand A - Initial Release ® G - Goodman Brand B - 1st Revision Configuration Major Revision M - Upflow / Horizontal A - Initial Release C - Downflow / Horizontal B - 1st Revision...
  • Page 5 AMEC961005CNAC AMEC961205DNAC GMEC960402BNAA ® GMEC960603BNAA Goodman Brand 96% Two Stage Heating / Two Stage Cooling Gas Furnace, Up GMEC960803BNAA flow/Horizontal Left and Right, 34.5" tall, Induced Draft, Nidec multi-speed ECMmotor. GMEC961004CNAA Stainless Steel tubular heat exchanger. 115 volt silicon nitride igniter. Left or right gas.
  • Page 6 PCBBF139 Control board which gives installer multiple CFM choices for constant fan ACEC961005BNAA mode. ® Goodman Brand 96% Two Stage Heating / Two Stage Cooling Gas Furnace, Counter GCEC960403BNAA flow/Horizontal Left and Right, 34.5" tall, Induced Draft, Nidec multi-speed ECMmotor.
  • Page 7 SYSTEM OPERATION Introduction avoid exposing the integrated control module to electrostatic discharge. This procedure is applicable to both installed and This is a Category lV furnace. This furnace uses a pressurized uninstalled (ungrounded) furnaces. venting system and must be installed per National and local codes requirements and the installation manual that was 1.
  • Page 8 SYSTEM OPERATION • Ensure the temperature of the return air entering the WARNING furnace is between 55°F and 100°F when the furnace is heating. • If the furnace is installed in an application where the O PREVENT PROPERTY DAMAGE, PERSONAL INJURY OR DEATH DUE TO FIRE, DO NOT INSTALL THIS FURNACE IN A MOBILE HOME, TRAILER, OR RECREATIONAL typical operating sound level of a furnace is deemed VEHICLE.
  • Page 9 SYSTEM OPERATION cements and glues *MEC96 MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS antistatic fabric softeners for clothes dryers and masonry acid washing materials POSITION* SIDES REAR FRONT BOTTOM FLUE • Isolate a non-direct vent furnace if it is installed near Upflow 0"...
  • Page 10 SYSTEM OPERATION Furnace Suspension f. After it has been determined that each appliance connected to the venting system properly vents when tested as outlined If suspending the furnace from rafters or joist, use 3/8” above, return doors, windows, exhaust fans, fireplace dampers threaded rod and 2”x2”x1/8”...
  • Page 11 SYSTEM OPERATION air for the other appliances. Refer to the latest edition of the 21 ft Required Volume > ________ _________ other other National Fuel Gas Code NFPA 54/ANSI Z223.1 (Section 1000 Btu/hr 9.3), or CAN/CGA B149 Installation Codes (Sections 7.2, 7.3, or 7.4), or applicable provisions of the local building (2) For fan-assisted appliances, calculate using the following equa- tion:...
  • Page 12 SYSTEM OPERATION 9.3.3.2* One Permanent Opening Method. One permanent open- The openings shall communicate directly, or by ducts, with the outdoors or spaces that freely communicate with the outdoors, as ings, commencing within 12 in. (300 mm) of the top of the enclosure, follows: shall be provided.
  • Page 13 SYSTEM OPERATION 9.3.6.2 Each of the appliances served shall be interlocked to the 9.3.8.8 Combustion air intake openings located on the exterior of mechanical air supply system to prevent main burner operation the building shall have the lowest side of the combustion air intake where the mechanical air supply system is not in operation.
  • Page 14 SYSTEM OPERATION DISCHARGE Side Side Return Return Duct Duct Connection Connection Bottom Return Duct Connection Figure 10 UPFLOW Counterflow UPRIGHT 1. Remove screws from the vent flange. 2. Remove the internal elbow and vent pipe Bottom 3. Cut 2 1/2” from the flange . Return Duct 4.
  • Page 15 SYSTEM OPERATION Propane Gas and/or High Altitude Installations that all piping and connections possess adequate structural integrity and support to prevent flue pipe separation, shifting, WARNING or sagging during furnace operation. Materials and Joining Methods OSSIBLE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH MAY OCCUR IF THE CORRECT CONVERSION KITS ARE NOT INSTALLED.
  • Page 16 SYSTEM OPERATION *MEC96/*CEC96 Direct Vent (2 - Pipe) and Non-Direct Vent (1- Pipe) OTHER THAN Maximum Allowable Length of Vent/Flue Pipe COMBUSTION AIR Pipe Size (3) (5) Number of Elbows TERMINATION INTAKE MODEL (in.) *M EC960303AN NON-DIRECT VENT & VENT/FLUE TERMINATION *M EC960403AN *M EC960603AN^ NO TERMINATIONS...
  • Page 17 SYSTEM OPERATION TEE (OPTIONAL) COMBUSTION AIR INTAKE 90° 12” MIN ELBOWS (OPTIONAL) HEIGHT DIFFERENCE BETWEEN *Not required for single pipe installation INTAKE AND VENT 3” - 24” 12” MIN TO ROOF OR HIGHEST ANTICIPATED SNOW LEVEL 12" MIN. ABOVE HIGHEST ANTICIPATED SNOW LEVEL ELBOWS Alternate Horizontal Vent Termination (Dual Pipe)
  • Page 18 SYSTEM OPERATION 4. The vent termination shall be located at least 3’ above any forced air inlet located within 10’; and at least 10’ from a combustion air intake of another appliance, except another direct vent furnace intake. 3”MIN 24”MAX 5.
  • Page 19 SYSTEM OPERATION Vent CAUTION Maintain 12" (18" for Canada) minimum clearance above highest anticipated snow level. Maximum of O PREVENT UNRELIABLE OPERATION OR EQUIPMENT DAMAGE, THE INLET 24" above roof. Combustion Air GAS SUPPLY PRESSURE MUST BE AS SPECIFIED ON THE UNIT RATING PLATE WITH ALL OTHER HOUSEHOLD GAS FIRED APPLIANCES OPERATING.
  • Page 20 SYSTEM OPERATION PROPANE GAS CONVERSION Natural Gas Capacity of Pipe In Cubic Feet of Gas Per Hour (CFH) WARNING Length of Nominal Black Pipe Size Pipe in Feet 1/2" 3/4" 1" 1 1/4" 1 1/2" OSSIBLE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH MAY OCCUR IF 1050 1600 THE CORRECT CONVERSION KITS ARE NOT INSTALLED.
  • Page 21 SYSTEM OPERATION GAS PIPING CHECKS Before placing unit in operation, leak test the unit and gas 5 to 15 PSIG First Stage (20 PSIG Max.) Regulator connections. Continuous 11" W.C. WARNING 200 PSIG Second Stage O AVOID THE POSSIBLITY OF EXPLOSION OR FIRE, NEVER USE A MATCH Maximum Regulator OR OPEN FLAME TO TEST FOR LEAKS.
  • Page 22 SYSTEM OPERATION When installing a propane storage tank, the contractor WARNING must consider proper tank sizing, safety, efficiency, ground characteristics and aesthetics. For a residential customer, F THE INFORMATION IN THESE INSTRUCTIONS IS NOT FOLLOWED EXACTLY, A the size may range from 100-1,000 gallons, depending on FIRE OR EXPLOSION MAY RESULT CAUSING PROPERTY DAMAGE, PERSONAL household use.
  • Page 23 SYSTEM OPERATION The integrated control module electronic air cleaner terminals (EAC) are energized with 115 volts whenever the circulator blower is energized. N 90% FURNACE UPRIGHT UPFLOW INSTALLATIONS, THE DRAIN TRAP MUST 24 VOLT THERMOSTAT WIRING BE MOUNTED ON THE OPPOSITE SIDE OF THE UNIT FROM THE JUNCTION BOX.
  • Page 24 SYSTEM OPERATION Single-Stage Heating Thermostat Application Room Furnace 1 Furnace 2 Thermostat A single-stage thermostat with only one heating stage may be used to control this furnace. The application of a single-stage thermostat offers a timed transition from low to high fire. The furnace will run on low stage for a fixed period of time before stepping up to high stage to satisfy the thermostat’s call for heat.
  • Page 25 SYSTEM OPERATION A return air filter is not supplied with the furnace. The installer Circulator Blower Speed Facts must supply a means of filtering all of the return air. Filter(s) 1. Motor speed Tap wiring must remain in factory position shall comply with UL900 or CAN/ULC-S111 Standards.
  • Page 26 SYSTEM OPERATION DIP Switch Settings PCBBF137 CONTROL BOARD DIP SWITCHES PCBBF137 Control Board DIP Switches Thermostat Selection Switches Heating Fan Off Delay Heating Functi on Swi tch Swi tch Purpos e Switches Group Number Auto 1 OFF* 2 ON* Hea t 10 Mi nutes 1 ON 2 OFF...
  • Page 27 SYSTEM OPERATION DIP Switch Settings PCBBF137 PCBBF139 *MEC960303AN - COOLING Static DIP Sw itches DIP Sw itches S2-1 S2-2 S2-3 S1-1 S1-2 S1-3 Tstat Call **OFF OFF OFF **OFF OFF OFF 1070 1040 1005 ON OFF OFF ON OFF OFF ON ON OFF / OFF ON ON ON ON OFF 1070...
  • Page 28 SYSTEM OPERATION DIP Switch Settings PCBBF137 PCBBF139 *MEC960403AN - COOLING Static DIP Sw itches DIP Sw itches S2-1 S2-2 S3-3 S1-1 S1-2 S1-3 Tstat Call **OFF OFF OFF **OFF OFF OFF 1070 1040 1005 ON OFF OFF ON OFF OFF ON ON OFF / OFF ON ON ON ON OFF 1070...
  • Page 29 SYSTEM OPERATION DIP Switch Settings PCBBF137 PCBBF139 *MEC960603AN - COOLING Static DIP Sw itches DIP Sw itches S2-1 S2-2 S3-3 S1-1 S1-2 S1-3 Tstat Call **OFF OFF OFF **OFF OFF OFF 1056 1026 ON OFF OFF ON OFF OFF ON ON OFF / OFF ON ON ON ON OFF 1056 1026...
  • Page 30 SYSTEM OPERATION DIP Switch Settings *MEC960603BN - COOLING Static DIP Switches S1-1 S1-2 S1-3 Tstat Call 1328 1287 1249 1215 1170 1131 1085 1046 **OFF OFF OFF 1236 1189 1149 1101 1066 1017 ON OFF OFF 1328 1287 1249 1215 1170 1131 1085...
  • Page 31 SYSTEM OPERATION DIP Switch Settings PCBBF139 *CEC960403BN - COOLING Static DIP Switches S1-1 S1-2 S1-3 Tstat Call **OFF OFF OFF 1229 1181 1150 1117 1078 1035 1002 1137 1096 1056 1018 ON OFF OFF 1137 1096 1056 1018 ON ON OFF 1229 1181 1150...
  • Page 32 SYSTEM OPERATION DIP Switch Settings PCBBF137 PCBBF139 *CEC960603BN - COOLING Static DIP Switches DIP Switches S2-1 S2-2 S2-3 S1-1 S1-2 S1-3 Tstat Call 1149 1104 1057 1017 **OFF OFF OFF **OFF OFF OFF 1236 1189 1149 1101 1066 1017 ON OFF OFF ON OFF OFF 1149 1104...
  • Page 33 SYSTEM OPERATION DIP Switch Settings PCBBF137 PCBBF139 **EC960803BN - COOLING Static DIP Switches DIP Switches S2-1 S2-2 S2-3 S1-1 S1-2 S1-3 Tstat Call **OFF OFF OFF **OFF OFF OFF 1111 1068 1025 ON OFF OFF ON OFF OFF ON ON OFF / OFF ON ON ON ON OFF 1111 1068...
  • Page 34 SYSTEM OPERATION DIP Switch Settings PCBBF137 PCBBF139 *MEC960804CN - COOLING Static DIP Switches DIP Switches S2-1 S2-2 S2-3 S1-1 S1-2 S1-3 Tstat Call 1185 1121 1058 **OFF OFF OFF **OFF OFF OFF 1727 1691 1642 1600 1545 1504 1449 1410 1408 1337 1279...
  • Page 35 SYSTEM OPERATION DIP Switch Settings PCBBF137 PCBBF139 *MEC961004CN - COOLING DIP Switches DIP Switches S2-1 S2-2 S2-3 S1-1 S1-2 S1-3 1312 1235 1170 1101 1037 **OFF OFF OFF **OFF OFF OFF 1772 1713 1662 1609 1540 1498 1452 1399 1004 ON OFF OFF^ ON OFF OFF^ 1312...
  • Page 36 SYSTEM OPERATION DIP Switch Settings PCBBF139 *CEC961005CN - COOLING Static DIP Switches S1-1 S1-2 S1-3 Tstat Call 1637 1577 1528 1467 1410 1369 1307 1256 **OFF OFF OFF 2069 2009 1978 1932 1923 1876 1834 1773 1477 1422 1364 1301 1244 1190 1135...
  • Page 37 SYSTEM OPERATION DIP Switch Settings PCBBF137 PCBBF139 *MEC961005CN - COOLING Static DIP Switches DIP Switches S2-1 S2-2 S2-3 S1-1 S1-2 S1-3 Tstat Call 1384 1324 1271 1204 1145 1088 1029 **OFF OFF OFF **OFF OFF OFF 2008 1963 1944 1916 1876 1839 1801...
  • Page 38 SYSTEM OPERATION DIP Switch Settings PCBBF137 PCBBF139 *MEC961205DN - COOLING DIP Switches DIP Switches S2-1 S2-2 S2-3 S1-1 S1-2 S1-3 1399 1327 1259 1185 1118 1051 **OFF OFF OFF **OFF OFF OFF 1683 1628 1565 1511 1445 1387 1340 1276 1106 1017 ON OFF OFF^...
  • Page 39 SYSTEM OPERATION • The control checks the low pressure switch for a shorted Horizontal Installations Filter(s) must be installed external to the furnace casing for condition. horizontal installations. For most installations it is preferable • The gas valve relay status is checked for proper to use a central return with filters installed in the duct behind operation.
  • Page 40 SYSTEM OPERATION SIMULTANEOUS CALL FOR LOW AND HIGH HEAT Duty Cycle % Valve Output Demand A call for both stages of heat will establish low fire before 0-38 Stage, 12 minute 2 Stage Light going to high fire 38-50 Stage, 10 minute 2 Stage Light to Average 50-62...
  • Page 41 SYSTEM OPERATION • The circulator fan is energized at cool speed after a Other Causes cool on delay. The electronic air cleaner will also be 1. Manifold Gas Pressure must be set for the gas being used, energized. Natural or L.P., high and low firing rates. If converted to •...
  • Page 42 SCHEDULED MAINTENANCE WARNING HIGH VOLTAGE ISCONNECT POWER BEFORE SERVICING OR INSTALLING THIS UNIT. ULTIPLE POWER SOURCES MAY BE PRESENT. AILURE TO DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH. CAUTION Maintenance Improper filter maintenance is the most common cause of F YOU MUST HANDLE THE ITNITOR, HANDLE WITH CARE.
  • Page 43 SCHEDULED MAINTENANCE CONDENSATE DRAINAGE SYSTEM (QUALIFIED 4. Inclined Manometer - to measure static pressure, pres- SERVICER ONLY) sure drop across coils, filters, and draft. The drain tubes, standpipe, and field supplied drain line must 5. Water Manometer (12”) - to test gas inlet and manifold be checked annually and cleaned as often as necessary to pressure.
  • Page 44 SCHEDULED MAINTENANCE CLOCKING A GAS METER 1. Turn off all gas appliances in the home. 2. Turn on the furnace. Ensure the furnace is operating at a 100% firing rate on 2 stage and modulating furnace product. 3. Once heating cycle is at a steady state (typically 15 minutes of operation), use a stopwatch to time how long it takes the smallest unit of measure dial on the gas meter to make a full revolution.
  • Page 45 SCHEDULED MAINTENANCE 5. Use this formula to verify the Cubic Feet per Hour (CFH) input determined in step 4 is correct: (3600 x Gas Meter Dial Size) / Time (seconds) = Cubic Feet per Hour (CFH) 3600 is used as there are 60 seconds in a minute and 60 minutes in an hour.
  • Page 46 SERVICING As more and more electronic's are introduced to the Heat- INCOMING POWER ing Trade, Polarization of incoming power and phasing of 120.00 0.00 primary to secondary voltage on transformers becomes more important. Polarization has been apparent in the Appliance industry since the introduction of the three prong plug, however, the Heating Industry does not use a plug for incoming power, but is hard wired.
  • Page 47 SERVICING CHECKING VOLTAGE CHECKING THERMOSTAT, WIRING WARNING WARNING HIGH VOLTAGE ISCONNECT POWER BEFORE SERVICING. ISCONNECT POWER BEFORE SERVICING OR 1. Remove the blower compartment door to gain access to CHANGING ANY ELECTRICAL WIRING. ULTIPLE POWER the thermostat low voltage wires located at the furnace SOURCES MAY BE PRESENT.
  • Page 48 SERVICING 1. Remove blower compartment door to gain access to the WARNING circulator blower motor and integrated ignition control. 2. Check for any obstruction that would keep the fan wheel HIGH VOLTAGE / fan motor from turning. ISCONNECT POWER BEFORE SERVICING OR 3.
  • Page 49 SERVICING 4. Consult proper tables for the quantity of air. If the total external static pressure exceeds the minimum or maximum allowable statics, check for closed dampers, registers, undersized and/or oversized poorly laid out duct SUPPLY work. RETURN . Checking Temperature Rise 3.
  • Page 50 SERVICING The following drawing illustrates the style of limit switches used on the 90% furnaces.  ENCLOSED DISK FRONT VIEW SIDE VIEW Primary Limit Control Style (90% Furnaces) COLOR IDENTIFYING WARNING Testing Primary Limit Control HIGH VOLTAGE 4. After completing check and/or replacement of primary ISCONNECT POWER BEFORE SERVICING OR CHANGING ANY ELECTRICAL WIRING.
  • Page 51 SERVICING WARNING HIGH VOLTAGE ISCONNECT POWER BEFORE SERVICING OR INSTALLING THIS UNIT. ULTIPLE POWER SOURCES MAY BE PRESENT. AILURE TO DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH. 1. Remove blower compartment door to gain access to the auxiliary. 2.
  • Page 52 SERVICING head insert with larger diameter center hole and a larger INDUCED DRAFT BLOWER MOTOR number of surrounding holes. The main burners are used to provide complete combustion WARNING of various fuels in a limited space, and transfer this heat of HIGH VOLTAGE the burning process to the heat exchanger.
  • Page 53 SERVICING WARNING High Fire Regulator ALL G ISCONNECT AS AND LECTRICAL OWER UPPLY. Adjust Regulator Vent Check orifice visually for distortion and/or burrs. Check orifice size with orifice sizing drills. STREAM B Common Terminal(C) White-Rodgers Model 36J54 Connected to Manometer White-Rodgers Model 36J54 Connected to Manometer The length of Dimension “A”...
  • Page 54 SERVICING 12. Remove the manometer hose from the hose barb fitting or outlet pressure tap. 13. Replace outlet pressure tap: White-Rodgers 36J54 valve: Turn outlet pressure test screw in to seal pressure port (clockwise, 7 in-lb mini- mum). 14. Turn on electrical power and gas supply to the system. 15.
  • Page 55 SERVICING Common WARNING Terminal(C) High Fire Coil HIGH VOLTAGE Terminal (HI) ISCONNECT ELECTRICAL POWER AND SHUT OFF GAS Low Fire Coil Terminal (LO) SUPPLY BEFORE SERVICING OR INSTALLING THIS UNIT. ULTIPLE POWER SOURCES MAY BE PRESENT. AILURE TO DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH. Inlet Pressure Tap 1/8 NPT WARNING...
  • Page 56 SERVICING pressure switch keeps the gas valve from opening in the event service agency. of condensate backing up in the secondary heat exchanger. In some areas the gas supplier may artificially derate the This could occur from improperly connected drains or a gas in an effort to compensate for the effects of altitude.
  • Page 57 4 seconds. to the air circulation blower following the heat on delay period. Goodman ® Brand and Amana® Brand Two-Stage 1. Check for 120 volts from Line 1 (Hot) to Line 2 (Neutral) at the ignition control. No voltage, check the door switch CHECKING FLAME SENSOR connections and wire harness for continuity.
  • Page 58 TROUBLESHOOTING Green Amber Symptoms Fault Description Check Cautions LED Code LED Code LED Code •Defective disconnect switch •Determine cause and restore •Confirm electrically safe •Furnace fails to operate •defective door switch • No •None •None •None proper high and low volt power condition before •Control board LED is off 115 volt power •No 24 volt...
  • Page 59 TROUBLESHOOTING Green Amber Symptoms Fault Description Check Cautions LED Code LED Code LED Code •Temperature rise, duct static, •Furnace does not •Four •Open limit circuit, main •Confirm electrically safe gas pressure, burner alignment, operate, four Red •None •None repeating limit, aux limit, or roll out condition before orifice plate position, wiring to flashes on control board...
  • Page 60 TROUBLESHOOTING Diagnostic Chart The ignition control is equipped with a momentary push Refer to the Troubleshooting Chart in the back of this manual button switch that can be used to display on the diagnostic for assistance in determining the source of unit operational LED the last five faults detected by the control.
  • Page 61 WIRING DIAGRAMS *MEC96 - REV AA WARNING:DISCONNECT POWER BEFORE SERVICING. WIRING TO UNIT MUST BE PROPERLY POLARIZED AND GROUNDED. ECM MTR HARNESS CIRCULATOR BLOWER EQUIPMENT GND FIELD GND FIELD SPLICE SWITCH (TEMP.) IGNITER SWITCH (PRESS.) OVERCURRENT PROT. DEVICE JUNCTION TERMINAL INTERNAL TO INTEGRATED CONTROL PLUG CONNECTION...
  • Page 62 WIRING DIAGRAMS *MEC96 - REV AB WARNING:DISCONNECT POWER BEFORE SERVICING. WIRING TO UNIT MUST BE PROPERLY POLARIZED AND GROUNDED. TO 115VAC/ 1Ø /60 HZ POWER SUPPLY WITH OVERCURRENT PROTECTION DEVICE WARNING: DISCONNECT POWER BEFORE SERVICING. WIRING TO UNIT MUST BE PROPERLY POLARIZED AND GROUNDED.
  • Page 63 WIRING DIAGRAMS *MEC96 - REV AC *CEC96 - REV AA WARNING:DISCONNECT POWER BEFORE SERVICING. WIRING TO UNIT MUST BE PROPERLY POLARIZED AND GROUNDED. ECM MTR HARNESS CIRCULATOR BLOWER EQUIPMENT GND FIELD GND FIELD SPLICE SWITCH (TEMP.) IGNITER SWITCH (PRESS.) OVERCURRENT PROT.
  • Page 64 GOODMAN BRAND ® AMANA BRAND ® is a registered trademark of Maytag Corporation or its related companies and is used under license. ® All rights reserved. Copyright © 2014-2020 Goodman Manufacturing Company, L.P.

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